JP3918833B2 - Remote monitoring system - Google Patents

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JP3918833B2
JP3918833B2 JP2004209335A JP2004209335A JP3918833B2 JP 3918833 B2 JP3918833 B2 JP 3918833B2 JP 2004209335 A JP2004209335 A JP 2004209335A JP 2004209335 A JP2004209335 A JP 2004209335A JP 3918833 B2 JP3918833 B2 JP 3918833B2
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貴誕 立石
俊幸 興津
市川　　隆
旬 杉山
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Meidensha Corp
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
    • Y04S20/20—End-user application control systems
    • Y04S20/221—General power management systems

Description

本装置は、遠方監視システムに係り、特に監視位置に設ける監視端末（または監視回路）の電源バックアップ方式に関する。   This apparatus relates to a remote monitoring system, and more particularly to a power backup system for a monitoring terminal (or monitoring circuit) provided at a monitoring position.

遠方監視システムとしては、例えば、各種電気設備の状態を現地の監視端末で監視し、中央の監視室コンピュータに監視情報の送信や異常発生を通信回線を利用して通知する方式のものがある。具体的には、配電系統における電気設備の接地線に流れる漏電電流を監視端末で監視し、漏洩電流の異常検出で警報を監視室コンピュータに通知する。   As a remote monitoring system, for example, there is a system in which the state of various electric facilities is monitored by a local monitoring terminal, and monitoring information is transmitted to a central monitoring room computer or an abnormal occurrence is notified using a communication line. Specifically, the monitoring terminal monitors the leakage current flowing in the ground line of the electrical equipment in the distribution system, and notifies the monitoring room computer of an alarm when the leakage current is detected abnormally.

このような遠方監視システムにおいて、監視端末は無人化される場合が多く、監視端末の電源に停電が発生すると監視機能の喪失になるため、電池電源による電源バックアップ回路を備えたものがある（例えば、特許文献１参照）。   In such a remote monitoring system, the monitoring terminal is often unmanned, and when a power failure occurs in the power supply of the monitoring terminal, the monitoring function is lost. , See Patent Document 1).

この制御電源のバックアップ回路の概略構成を図８に示す。商用電源（ＡＣ１００Ｖ）１の交流電力をスイッチング電源などのＡＣ／ＤＣ変換器２によって電圧制御した直流電力に変換し、制御電源の電圧出力Ｖｄｄ（５Ｖ）を得る。バックアップ回路は、停電を電圧低下検出回路３による交流入力の一次側で検出し、この停電検出信号をホトカプラなどの外部−内部絶縁回路４によって絶縁して取り込み、この停電検出信号によって電池制御回路５がバッテリ切替回路６に電源切替信号を出力する。この切替信号によりバッテリ切替回路６はＡＣ／ＤＣ変換器２の出力に代えて、一次電池７を電源とした電圧Ｖｄｄの出力を得る。   A schematic configuration of the backup circuit of the control power supply is shown in FIG. The AC power of the commercial power supply (AC100V) 1 is converted to DC power that is voltage-controlled by an AC / DC converter 2 such as a switching power supply to obtain a voltage output Vdd (5V) of the control power supply. The backup circuit detects a power failure on the primary side of the AC input by the voltage drop detection circuit 3, and insulates and captures this power failure detection signal by the external-internal insulation circuit 4 such as a photocoupler, and the battery control circuit 5 by this power failure detection signal. Outputs a power switching signal to the battery switching circuit 6. By this switching signal, the battery switching circuit 6 obtains an output of the voltage Vdd using the primary battery 7 as a power source instead of the output of the AC / DC converter 2.

この電源を監視端末に適用する場合、コンピュータ回路８は、外部−内部絶縁回路４からの停電検出出力を割り込み（ＮＭＩ）信号として受け、一次電池７を電源として、中央の監視室コンピュータに監視情報や電源異常発生を通知する。ことができる。
特開平８−３２８６７４号公報 When this power source is applied to the monitoring terminal, the computer circuit 8 receives the power failure detection output from the external-internal insulation circuit 4 as an interrupt (NMI) signal, and uses the primary battery 7 as a power source to monitor information to the central monitoring room computer. Notification of power failure. be able to.
Japanese Patent Application Laid-Open No. 8-328673

前記のように、従来の電源バックアップ方式は、停電時にはその一次電圧の低下で電池電源に切替え、一次電圧の復旧で電源を電池から交流電源側に戻す。   As described above, the conventional power backup system switches to the battery power source when the primary voltage is lowered during a power failure, and returns the power source from the battery to the AC power source side when the primary voltage is restored.

ここで、交流電源には開閉サージなどが発生することが多い。また、交流電源には、極めて短い時間だけ電圧が低下する瞬断が起きることが多い。これらサージ時間や瞬断時間によっては、電圧低下検出回路３が誤って応動することが考えられ、電圧低下検出回路３が誤って応動すると、その度に電圧低下検出で電池電源に切替えられる。この場合、電池の消耗を早めることになるし、電池の小型化を図ることができない。また、誤った停電検出を上位のコンピュータに誤って通知してしまうという問題がある。   Here, there are many switching surges or the like in the AC power supply. In addition, the AC power supply often has an instantaneous interruption in which the voltage decreases for a very short time. Depending on the surge time and the instantaneous interruption time, the voltage drop detection circuit 3 may react erroneously. When the voltage drop detection circuit 3 reacts erroneously, it is switched to the battery power supply by detecting the voltage drop each time. In this case, battery consumption is accelerated, and the battery cannot be reduced in size. In addition, there is a problem that an erroneous power failure detection is erroneously notified to a host computer.

この対策として、電圧低下検出回路３による検出と電池制御回路５による切替制御に時間遅れを持たせることが考えられるが、この時間遅れの設定や設計が不適当になると、実際に停電発生したときにコンピュータ回路８等の停電を引き起こし、コンピュータ回路８の誤った処理や制御、さらには監視端末の機能喪失を起こす問題が生じる。   As a countermeasure, it is conceivable that there is a time delay between the detection by the voltage drop detection circuit 3 and the switching control by the battery control circuit 5, but if the setting or design of this time delay becomes inappropriate, a power failure will actually occur. This causes a power failure of the computer circuit 8 and the like, resulting in a problem of erroneous processing and control of the computer circuit 8, and further loss of the function of the monitoring terminal.

本発明の目的は、瞬断等による誤った停電検出を無くし、また電池の消耗を少なくしながら、監視装置の停電を確実に防止してバックアップ電源への自動切り替えとその復旧処理ができる電源バックアップ方式を提供することにある。   An object of the present invention is to provide a power backup capable of automatically switching to a backup power source and recovering the power by reliably preventing a power failure of a monitoring device while eliminating erroneous power failure detection due to a momentary interruption or the like and reducing battery consumption. To provide a method.

本発明は、前記の課題を解決するため、ＡＣ／ＤＣ変換器の二次側出力の電圧が低下し始めたことを停電として検出し、この検出を基にバッテリ切替制御を行い、さらにコンピュータ回路による処理データの退避処理、上位のコンピュータへの停電通知を行うようにしたもので、以下の構成を特徴とする。   In order to solve the above-mentioned problem, the present invention detects that the secondary output voltage of the AC / DC converter has started to decrease as a power failure, performs battery switching control based on this detection, and further includes a computer circuit. The processing data is saved by the above and a power failure notification is sent to the host computer, and has the following configuration.

（１）商用電源から制御電源を得るＡＣ／ＤＣ変換器を有して監視位置に設けられ、商用電源の停電時に前記ＡＣ／ＤＣ変換器の出力に代えてバッテリ切替回路で一次電池電源に切替える電源バックアップ手段を備えた監視端末と、この監視端末と上位コンピュータとの間で監視情報を通信する遠方監視システムにおいて、
前記電源バックアップ手段は、
前記商用電源の電圧低下を検出する電圧低下検出回路と、
前記電圧低下検出回路で検出された電圧低下検出信号を絶縁して取り込む外部−内部絶縁回路と、
前記外部−内部絶縁回路で絶縁され、取り込まれた電圧低下検出信号が与えられ、かつ前記ＡＣ／ＤＣ変換器の二次側出力が低下し始めたときに前記バッテリ切替回路に一次電池電源への切替え出力を得る電池制御回路と、
復電時に前記ＡＣ／ＤＣ変換器の一次側の電圧の復電を検出したときに前記バッテリ切替回路を商用電源側に切替え、前記上位コンピュータには無停電で復電通報などの処理を行う手段と、
を備えたことを特徴とする。
（２）商用電源から制御電源を得るＡＣ／ＤＣ変換器を有して監視位置に設けられ、商用電源の停電時に前記ＡＣ／ＤＣ変換器の出力に代えてバッテリ切替回路で一次電池電源に切替える電源バックアップ手段を備えた監視端末と、この監視端末と上位コンピュータとの間で監視情報を通信する遠方監視システムにおいて、
前記電源バックアップ手段は、
前記商用電源の電圧低下を検出する電圧低下検出回路と、
前記電圧低下検出回路で検出された電圧低下検出信号を絶縁して取り込む外部−内部絶縁回路と、
前記外部−内部絶縁回路で絶縁され、取り込まれた電圧低下検出信号をＮＭＩ割り込み信号とし、その時点の処理データの退避を行い、前記ＡＣ／ＤＣ変換器の二次側電圧低下が始まる直前にバッテリ切替信号を発生し、この後に前記上位コンピュータに停電通知を行うコンピュータ回路と、
前記外部−内部絶縁回路で絶縁され、取り込まれた電圧低下検出信号が与えられ、かつ前記コンピュータ回路からバッテリ切替信号を発生したときに前記バッテリ切替回路に一次電池電源への切替え出力を得る電池制御回路と、
復電時に前記ＡＣ／ＤＣ変換器の一次側の電圧の復電を検出したときに前記バッテリ切替回路を商用電源側に切替え、前記上位コンピュータには無停電で復電通報などの処理を行う手段と、
を備えたことを特徴とする。 (1) An AC / DC converter that obtains control power from a commercial power source is provided at a monitoring position, and is switched to a primary battery power source by a battery switching circuit instead of the output of the AC / DC converter when a commercial power source fails. In a remote monitoring system that communicates monitoring information between a monitoring terminal equipped with a power backup means and this monitoring terminal and a host computer,
The power backup means includes
A voltage drop detection circuit for detecting a voltage drop of the commercial power supply;
An external-internal insulation circuit that insulates and captures the voltage drop detection signal detected by the voltage drop detection circuit;
Insulated by the external-internal insulation circuit, when the taken-in voltage drop detection signal is given and the secondary output of the AC / DC converter starts to drop, the battery switching circuit is supplied to the primary battery power supply . A battery control circuit for obtaining a switching output;
Means for switching the battery switching circuit to the commercial power source side when the power recovery of the primary side voltage of the AC / DC converter is detected at the time of power recovery, and performing processing such as power recovery notification to the host computer without power failure When,
It is provided with.
(2) An AC / DC converter that obtains control power from a commercial power source is provided at the monitoring position, and is switched to the primary battery power source by a battery switching circuit instead of the output of the AC / DC converter when a commercial power source fails. In a remote monitoring system that communicates monitoring information between a monitoring terminal equipped with a power backup means and this monitoring terminal and a host computer,
The power backup means includes
A voltage drop detection circuit for detecting a voltage drop of the commercial power supply;
An external-internal insulation circuit that insulates and captures the voltage drop detection signal detected by the voltage drop detection circuit;
A voltage drop detection signal insulated and captured by the external-internal insulation circuit is used as an NMI interrupt signal, processing data at that time is saved, and the battery immediately before the secondary voltage drop of the AC / DC converter starts. A computer circuit that generates a switching signal and then notifies the host computer of a power failure;
Battery control which is insulated by the external-internal insulation circuit and receives a voltage drop detection signal taken in, and obtains a switching output to the primary battery power source in the battery switching circuit when a battery switching signal is generated from the computer circuit Circuit,
Means for switching the battery switching circuit to the commercial power source side when the power recovery of the primary side voltage of the AC / DC converter is detected at the time of power recovery, and performing processing such as power recovery notification to the host computer without power failure When,
It is provided with.

（３）商用電源から制御電源を得るＡＣ／ＤＣ変換器を有して監視位置に設けられ、商用電源の停電時に前記ＡＣ／ＤＣ変換器の出力に代えてバッテリ切替回路で一次電池電源に切替える電源バックアップ手段を備えた監視端末と、この監視端末と上位コンピュータとの間で監視情報を通信する遠方監視システムにおいて、
前記電源バックアップ手段は、
前記ＡＣ／ＤＣ変換器の二次側電圧が低下し始めたことを検出する電圧低下検出回路と、
前記電圧低下検出回路で検出された電圧低下検出信号で前記バッテリ切替回路に一次電池電源への切替え出力を得る電池制御回路と、
前記電池制御回路から発生する停電検出信号でＮＭＩ割り込み信号とし、その時点の処理データの退避および前記上位コンピュータに停電通知を行い、この後に前記電池制御回路に一次電池電源による駆動切りの信号を発生するコンピュータ回路と、
復電時にＡＣ／ＤＣ変換器の二次側の電圧の復電を検出したときに前記バッテリ切替回路を商用電源側に切替え、前記上位コンピュータには無停電で復電通報などの処理を行う手段と、
を備えたことを特徴とする。 (3) An AC / DC converter that obtains control power from a commercial power source is provided at the monitoring position, and is switched to the primary battery power source by a battery switching circuit instead of the output of the AC / DC converter when the commercial power source fails. In a remote monitoring system that communicates monitoring information between a monitoring terminal equipped with a power backup means and this monitoring terminal and a host computer,
The power backup means includes
A voltage drop detection circuit for detecting that the secondary side voltage of the AC / DC converter has started to drop;
A battery control circuit for obtaining a switching output to a primary battery power source in the battery switching circuit by a voltage drop detection signal detected by the voltage drop detection circuit;
The power failure detection signal generated from the battery control circuit is used as an NMI interrupt signal, the processing data at that time is saved and a power failure notification is sent to the host computer, and then a signal for turning off the primary battery power is generated in the battery control circuit. Computer circuit to
Means for switching the battery switching circuit to the commercial power supply side when the power recovery of the secondary side voltage of the AC / DC converter is detected at the time of power recovery, and performing processing such as power recovery notification to the host computer without power failure When,
It is provided with.

以上のとおり、本発明によれば、以下の効果がある。   As described above, the present invention has the following effects.

実施形態１では、商用電源の電圧低下検出とＡＣ／ＤＣ変換器の一次側電圧低下の始まりを検出することにより、二次側の停止に裕度を持って電池電源への切替が可能である。   In the first embodiment, it is possible to switch to a battery power source with a margin for stopping the secondary side by detecting the voltage drop detection of the commercial power source and the start of the primary side voltage drop of the AC / DC converter. .

実施形態２では、商用電源の電圧低下検出で、コンピュータ回路への割り込みによるソフトウェア処理することにより、停電検出起動によるソフトウェア処理、すなわち停電通報処理、停電によるＤＩ誤検出ロック、ＤＯ誤出力ロックなど、外部回路との協調をソフトウェア処理が可能となる。また、ソフトウェア処理であるので、停電検出処理と併用して処理が可能である。   In the second embodiment, by detecting the voltage drop of the commercial power supply and performing software processing by interrupting the computer circuit, software processing by power failure detection activation, that is, power failure notification processing, DI erroneous detection lock due to power failure, DO erroneous output lock, etc. Software processing is possible for cooperation with external circuits. In addition, since it is software processing, processing can be performed in combination with the power failure detection processing.

実施形態３では、停電時に電源回路の二次側の電圧の低下を検出し、電池切替えを行うことにより、電源一次側と絶縁回路が不要であり、二次側回路だけで、停電によるコンピュータ処理が可能となる。また、停電検出回路用の電子デバイスが少量で済み、実装面積の縮小化が可能である。   In the third embodiment, by detecting a voltage drop on the secondary side of the power supply circuit at the time of a power failure and switching the battery, the power supply primary side and the insulating circuit are unnecessary, and only the secondary side circuit performs computer processing due to the power failure. Is possible. Further, a small amount of electronic device for the power failure detection circuit is required, and the mounting area can be reduced.

実施形態４では、復電時に電源回路の一次側の電圧で復電を検出し、ハードウェアによる復電制御を行うことができる。   In the fourth embodiment, at the time of power recovery, power recovery can be detected by the voltage on the primary side of the power supply circuit, and power recovery control by hardware can be performed.

実施形態５では、復電時に電源回路の二次側の電圧の復電を検出し、ハードウェアによる復電制御を行うことができる。   In the fifth embodiment, power recovery can be controlled by hardware by detecting power recovery of the secondary side voltage of the power supply circuit at the time of power recovery.

実施形態６では、復電時に電源回路の一次側の電圧の復電を検出し、ソフトウェアによる復電制御を行うことができ、実施形態４、５のようにハードウェアによらないため、復電時の電池ＯＦＦ処理も、停電となった後の必要な処理後とのシャットダウン処理として、コンピュータ回路自身で電池ＯＦＦとし、停止させることが容易になる。   In the sixth embodiment, it is possible to detect power recovery of the primary voltage of the power supply circuit at the time of power recovery and perform power recovery control by software. As for the battery OFF process at the time, as a shutdown process after the necessary process after a power failure, it is easy to turn off the battery by the computer circuit itself and stop it.

本実施形態は、図１に示すハードウェア回路構成とし、停電を電源回路の一次側電圧の低下で検出し、バッテリ切替回路６のＯＮ／ＯＦＦ切替をＡＣ／ＤＣ変換器の二次側（出力）電圧によって制御する方式とする。   In the present embodiment, the hardware circuit configuration shown in FIG. 1 is used, a power failure is detected by a decrease in the primary voltage of the power supply circuit, and ON / OFF switching of the battery switching circuit 6 is performed on the secondary side (output) of the AC / DC converter. ) Use a voltage control method.

同図が図８と異なる部分は、バッテリ切替回路６の入力には電圧低下検出回路３からの検出信号に加えて、ＡＣ／ＤＣ変換器２の出力電圧が一定レベル以上か否かのバッテリ切替信号を入力する点にある。   8 differs from FIG. 8 in that the battery switching circuit 6 determines whether the output voltage of the AC / DC converter 2 is above a certain level in addition to the detection signal from the voltage drop detection circuit 3 at the input of the battery switching circuit 6. The point is to input the signal.

電圧低下検出回路３による一次側の電圧低下検出は、例えば、６０〜７０Ｖ程度を瞬断保証電圧として電圧低下を検出する。ＡＣ／ＤＣ変換器２は、ＡＣ／ＤＣ変換機能の他に、その出力電圧が規定電圧にあるか否かの判定出力としてバッテリ切替信号（リセット信号）を発生する機能を設ける。このバッテリ切替信号の発生には、例えば、規定電圧よりも少し低い比較基準電圧をもつ簡単なコンパレータ回路によって実現される。   The voltage drop detection on the primary side by the voltage drop detection circuit 3 detects a voltage drop using, for example, about 60 to 70V as an instantaneous interruption guarantee voltage. In addition to the AC / DC conversion function, the AC / DC converter 2 has a function of generating a battery switching signal (reset signal) as a determination output as to whether or not the output voltage is at a specified voltage. The generation of the battery switching signal is realized by, for example, a simple comparator circuit having a comparison reference voltage slightly lower than a specified voltage.

電池制御回路５は、停電検出信号が入力され、かつバッテリ切替信号が与えられた（ＡＣ／ＤＣ変換器の出力電圧が低下し始めた）ときに、バッテリ切替回路６に対し、バッテリ切替指令を出す。   The battery control circuit 5 issues a battery switching command to the battery switching circuit 6 when the power failure detection signal is input and the battery switching signal is given (the output voltage of the AC / DC converter starts to decrease). put out.

本実施形態によるバックアップ動作は、図２に示すタイムチャートで説明する。商用電源１（ＡＣ１００Ｖ）の印加によって（時刻ｔ１）、ＡＣ／ＤＣ変換器２の整流出力は一定電圧まで上昇し、これに伴ってＡＣ／ＤＣ変換器２の出力電圧（５Ｖ）は正規の電圧出力を得る。また、ＡＣ／ＤＣ変換器２は、出力電圧（５Ｖ）の確立によってバッテリ切替信号を復帰（電圧低下でない）させる。   The backup operation according to the present embodiment will be described with reference to the time chart shown in FIG. With the application of the commercial power source 1 (AC 100V) (time t1), the rectified output of the AC / DC converter 2 rises to a certain voltage, and accordingly the output voltage (5V) of the AC / DC converter 2 is a normal voltage. Get the output. Further, the AC / DC converter 2 restores the battery switching signal (not a voltage drop) by establishing the output voltage (5V).

一方、停電検出回路３は商用電源１（ＡＣ１００Ｖ）の印加時点から一定時間の遅れをもって停電検出信号のＯＦＦ出力を得る（時刻ｔ２）。この出力によって、バッテリ切替回路６はＯＦＦ状態にあり、ＡＣ／ＤＣ変換器２による電圧Vdd（５V）の電源供給を行う。   On the other hand, the power failure detection circuit 3 obtains an OFF output of the power failure detection signal with a certain time delay from the application time point of the commercial power source 1 (AC 100V) (time t2). Due to this output, the battery switching circuit 6 is in an OFF state, and the AC / DC converter 2 supplies power of the voltage Vdd (5 V).

この状態において、商用電源１に瞬断が発生したとき（時刻ｔ３）、停電検出回路３はその期間だけの停電検出を行うが、ＡＣ／ＤＣ変換器２がバッテリ切替信号を発生しないため、バッテリ切替えは行わない。   In this state, when a momentary interruption occurs in the commercial power source 1 (time t3), the power failure detection circuit 3 performs power failure detection only during that period, but the AC / DC converter 2 does not generate a battery switching signal. No switching is performed.

一方、商用電源１に停電が発生したとき（時刻ｔ４）、ＡＣ／ＤＣ変換器２の電圧が低下し始めたときにバッテリ切替信号が発生し、電池制御回路５はバッテリ切替回路６に切替信号を出力し、一次電池７を電源として出力電圧Ｖｄｄを得る。停電が解消したとき（復電時）は、時刻ｔ１→ｔ２と同様になる。   On the other hand, when a power failure occurs in the commercial power supply 1 (time t4), a battery switching signal is generated when the voltage of the AC / DC converter 2 starts to decrease, and the battery control circuit 5 sends a switching signal to the battery switching circuit 6. And the output voltage Vdd is obtained using the primary battery 7 as a power source. When the power failure is resolved (when power is restored), it is the same as time t1 → t2.

したがって、本実施形態によれば、バッテリ切替えは、一次電圧の低下で直ちに切替えることなく、ＡＣ／ＤＣ変換器２の二次側電圧の低下が始まるときに初めて切替える。このため、商用電源の瞬断（二次側電圧低下が始めるまでの時間内の瞬断）によるバッテリ切替えを起こすことがなく、一次電池７の無駄な消耗を無くすことができる。   Therefore, according to the present embodiment, the battery switching is not performed immediately when the primary voltage is decreased, but is switched for the first time when the secondary side voltage of the AC / DC converter 2 starts to decrease. For this reason, battery switching due to a momentary interruption of the commercial power supply (instantaneous interruption within the time until the secondary voltage starts to drop) does not occur, and wasteful consumption of the primary battery 7 can be eliminated.

また、バッテリ切替えは、ＡＣ／ＤＣ変換器２の二次側電圧の低下が始まるタイミングで行うため、この切替えが早すぎたり、遅すぎることなく、確実なバッテリ切替えになる。   In addition, since the battery switching is performed at the timing when the secondary side voltage of the AC / DC converter 2 starts to decrease, the battery switching can be surely performed without being too early or too late.

（実施形態２）
本実施形態は、停電時に電源回路の一次側電圧低下を検出し、コンピュータ回路への割り込みによるソフトウェア処理で電池切替えを行うバックアップ方式とする。 (Embodiment 2)
In the present embodiment, a backup method is performed in which a primary voltage drop in the power supply circuit is detected during a power failure, and the battery is switched by software processing using an interrupt to the computer circuit.

本実施形態は、図３に示す回路構成とし、図４に示すタイムチャートになる。図３が図１と異なる部分は、電圧低下検出信号をコンピュータ回路８へのＮＭＩ割り込み信号とし、コンピュータ回路８によるソフトウェアによりバッテリ切替信号を発生する点にある。また、コンピュータ回路８は、電圧低下検出信号が消滅（復電）したときに一定の確認時間を有してバッテリ切替信号を復帰させる。   This embodiment has the circuit configuration shown in FIG. 3 and the time chart shown in FIG. 3 differs from FIG. 1 in that the voltage drop detection signal is used as an NMI interrupt signal to the computer circuit 8 and a battery switching signal is generated by software by the computer circuit 8. Further, the computer circuit 8 restores the battery switching signal with a certain confirmation time when the voltage drop detection signal disappears (recovers power).

コンピュータ回路８は、ＮＭＩ割り込みの発生で、その時点の処理データの一時退避などのデータ保持を行い、ＡＣ／ＤＣ変換器２の二次側電圧低下が始まる直前のタイミングでバッテリ切替信号を発生し、この後に停電通知を行う。このときのタイミングは、実機の試験運転によって予め測定しておくか、もしくは時間的な余裕を持たせて設定しておく。   When the NMI interrupt is generated, the computer circuit 8 holds data such as temporary saving of the processing data at that time, and generates a battery switching signal at a timing immediately before the secondary side voltage drop of the AC / DC converter 2 starts. Then, a power failure notification is made. The timing at this time is measured in advance by a test operation of an actual machine, or is set with a time margin.

本実施形態によれば、コンピュータ回路８によるＮＭＩ処理によって、電池制御回路５を通して電源を電池７側に切り替える。この場合、コンピュータ回路８は、バッテリ切替信号出力を適当なタイミングで発生することで、電源の瞬断には応動しない切替制御と、通知処理などとの協調を得るのが容易となる。すなわち、停電通報処理、停電によるＤＩ誤検出ロック、ＤＯ誤出力ロックなど、外部回路との協調をソフトウェア処理可能である。また、商用電源の瞬断に誤って停電通知をすることが無くなる。   According to this embodiment, the power supply is switched to the battery 7 side through the battery control circuit 5 by NMI processing by the computer circuit 8. In this case, the computer circuit 8 can easily obtain the cooperation between the switching control that does not respond to the instantaneous interruption of the power supply and the notification processing by generating the battery switching signal output at an appropriate timing. That is, it is possible to perform software processing for cooperation with external circuits such as power failure notification processing, DI erroneous detection lock due to power failure, and DO erroneous output lock. In addition, it is not possible to notify the power failure accidentally when the commercial power supply is interrupted.

コンピュータ回路８によるソフトウェア処理例を図５に示す。同図の（ａ）は電池電源へのＯＮ切替フローを示し、ＮＭＩ割り込み処理を実行後も、電圧低下が検出されていれば電池電源への切替処理を行う。（ｂ）はＯＦＦ切替フローを示し、電圧低下復帰を確認したときのみ電池切替をＯＦＦ処理する。（ｃ）はＨ／ＷのＯＦＦフローを示し、電源オン後にシステム監視によるバッテリ切替信号が有る場合に電池電源切替をＯＦＦ処理する。   An example of software processing by the computer circuit 8 is shown in FIG. (A) of the figure shows an ON switching flow to the battery power source. If a voltage drop is detected even after executing the NMI interrupt processing, the switching processing to the battery power source is performed. (B) shows an OFF switching flow, and the battery switching is turned OFF only when the voltage drop recovery is confirmed. (C) shows the H / W OFF flow. When there is a battery switching signal by system monitoring after the power is turned on, the battery power switching is turned off.

（実施形態３）
本実施形態は、停電時に電源回路の二次側の電圧の低下を検出し、コンピュータ回路によるソフトウェア処理で電池電源に切替えるバックアップ方式とする。 (Embodiment 3)
In the present embodiment, a backup method is adopted in which a drop in the voltage on the secondary side of the power supply circuit is detected during a power failure and the battery power is switched by software processing by a computer circuit.

本実施形態は図６に示す回路構成とし、図１の実施形態１と異なる部分は、電圧低下検出回路３がＡＣ／ＤＣ変換器２の一次側電圧を監視するのではなく、その２次側を監視し、この監視で停電検出したときに電池制御回路５が直ちにバッテリ切替制御し、この後にコンピュータ回路８が停電通知し、この完了でバッテリ電源を切り制御する点にある。   The present embodiment has the circuit configuration shown in FIG. 6, and the difference from the first embodiment in FIG. 1 is that the voltage drop detection circuit 3 does not monitor the primary voltage of the AC / DC converter 2 but its secondary side. When the power failure is detected in this monitoring, the battery control circuit 5 immediately controls the battery switching, and thereafter the computer circuit 8 notifies the power failure, and the battery power is turned off and controlled upon completion.

本実施形態によるバックアップ動作は、図７に示すように、電圧低下検出回路３の検出信号の「Ｈ」→「Ｌ」状変を電池制御回路５で認識し、この認識で直ちにバッテリ切替回路６を動作させ、電池７から電源Ｖｄｄの供給を開始する。これと並行して、電池制御回路５より、コンピュータ回路８に対し、停電中であることを伝える。コンピュータ回路８は、停電の通知処理を行い、この終了で電池制御回路５に対し、バッテリ切替回路６に切りの信号（ＯＦＦ信号）を発生し、電池７からの供給も停止させる。   In the backup operation according to the present embodiment, as shown in FIG. 7, the battery control circuit 5 recognizes the “H” → “L” state change of the detection signal of the voltage drop detection circuit 3, and the battery switching circuit 6 immediately recognizes this recognition. To start supplying the power source Vdd from the battery 7. In parallel with this, the battery control circuit 5 notifies the computer circuit 8 that a power failure is occurring. The computer circuit 8 performs a power failure notification process, and at this time, the battery control circuit 5 generates a cut signal (OFF signal) to the battery switching circuit 6 and stops the supply from the battery 7.

なお、ＡＣ／ＤＣ変換器２の出力端に設けるダイオード９によって、バッテリ切替回路６の出力と突き合わせる構成により、電圧Ｖｄｄの回り込みを抑止し、電圧低下検出回路３が停電・復電を検出可能としている。   The diode 9 provided at the output terminal of the AC / DC converter 2 is configured to match the output of the battery switching circuit 6 to prevent the voltage Vdd from wrapping around, and the voltage drop detection circuit 3 can detect a power failure / recovery. It is said.

本実施形態によれば、前記までの実施形態１、２の作用効果に加えて、ＡＣ／ＤＣ変換器２の二次側で停電・復電を検出するため、商用電源１と内部回路の絶縁が不必要となり、外部−内部絶縁回路４を省略してバックアップ回路構成を単純化できる。   According to the present embodiment, in addition to the effects of the first and second embodiments described above, in order to detect a power failure / recovery on the secondary side of the AC / DC converter 2, the insulation between the commercial power source 1 and the internal circuit is achieved. Is unnecessary, and the external-internal insulation circuit 4 can be omitted to simplify the backup circuit configuration.

（実施形態４）
本実施形態は、復電時に電源回路の一次側の電圧の復電を検出し、ハードウェアで自動的に商用電源側に切替える方式とする。 (Embodiment 4)
In the present embodiment, a power recovery of the voltage on the primary side of the power supply circuit is detected at the time of power recovery, and the system is automatically switched to the commercial power supply side by hardware.

本実施形態は、図１に示す構成において、ＡＣ／ＤＣ変換器２の一次側の復帰電圧レベル（例えば、６０〜７０Ｖ）を検出し、電池制御回路５にて、バッテリ切替回路６を制御し、一次電池をＯＦＦする。   In the configuration shown in FIG. 1, the present embodiment detects a return voltage level (for example, 60 to 70 V) on the primary side of the AC / DC converter 2 and controls the battery switching circuit 6 with the battery control circuit 5. Turn off the primary battery.

このＯＦＦ制御は、図３に示す構成に適用する場合、コンピュータ回路により行うことができる。この場合、コンピュータ回路は上位コンピュータに復電通報を行わせることもできる。   This OFF control can be performed by a computer circuit when applied to the configuration shown in FIG. In this case, the computer circuit can also cause the host computer to issue a power recovery notification.

（実施形態５）
本実施形態は、復電時に電源回路の二次側の電圧の復電を検出し、ハードウェアとソフトウェアで自動的に商用電源側に切替える方式とする。 (Embodiment 5)
In the present embodiment, a power recovery of the secondary side voltage of the power supply circuit is detected at the time of power recovery, and the system is automatically switched to the commercial power supply side by hardware and software.

本実施形態は、図６に示す構成において、ＡＣ／ＤＣ変換器２の二次側電圧（＋５Ｖ）の復帰電圧レベル（例えば、４.５Ｖ）を検出し、電池制御回路５にて、バッテリ切替回路６を制御し、一次電池をＯＦＦする。同時に、コンピュータ回路８に対し、復電したことを伝える。   In the present embodiment, in the configuration shown in FIG. 6, the return voltage level (for example, 4.5 V) of the secondary side voltage (+5 V) of the AC / DC converter 2 is detected, and the battery control circuit 5 switches the battery. The circuit 6 is controlled to turn off the primary battery. At the same time, the computer circuit 8 is informed that the power has been restored.

（実施形態６）
本実施形態は、復電時に電源回路の一次側の電圧の復電を検出し、ソフトウェアで自動的に商用電源側に切替える方式とする。 (Embodiment 6)
In the present embodiment, a power recovery of the primary side voltage of the power supply circuit is detected at the time of power recovery, and the system automatically switches to the commercial power supply side by software.

本実施形態は、図３に示す構成において、コンピュータ回路８が一次側の電圧低下状態をポーリングして復電検出を行い、バッテリ切替回路６を通して電池をＯＦＦとする。この場合、ＮＭＩの状態を監視することで、低下検出状態を監視できる。なお、本実施形態は、図１、図２に示す構成に適用することができる。   In the present embodiment, in the configuration shown in FIG. 3, the computer circuit 8 polls the primary side voltage drop state to detect power recovery, and turns off the battery through the battery switching circuit 6. In this case, the drop detection state can be monitored by monitoring the NMI state. The present embodiment can be applied to the configurations shown in FIGS.

本発明の実施形態１を示すバックアップ回路図。The backup circuit diagram which shows Embodiment 1 of this invention. 実施形態１のタイムチャート。3 is a time chart of the first embodiment. 本発明の実施形態２を示すバックアップ回路図。The backup circuit diagram which shows Embodiment 2 of this invention. 実施形態２のタイムチャート。4 is a time chart of the second embodiment. 実施形態２におけるコンピュータ回路８によるソフトウェア処理例。9 illustrates an example of software processing by the computer circuit 8 according to the second embodiment. 本発明の実施形態３を示すバックアップ回路図。The backup circuit diagram which shows Embodiment 3 of this invention. 実施形態３のタイムチャート。10 is a time chart of the third embodiment. 従来のバックアップ回路図。The conventional backup circuit diagram.

符号の説明Explanation of symbols

１ 商用電源
２ ＡＣ／ＤＣ変換器
３ 電圧低下検出回路
４ 外部−内部絶縁回路
５ 電池制御回路
６ バッテリ切替回路
７ 一次電池
８ コンピュータ回路
９ ダイオード
DESCRIPTION OF SYMBOLS 1 Commercial power supply 2 AC / DC converter 3 Voltage drop detection circuit 4 External-internal insulation circuit 5 Battery control circuit 6 Battery switching circuit 7 Primary battery 8 Computer circuit 9 Diode

Claims (3)

商用電源から制御電源を得るＡＣ／ＤＣ変換器を有して監視位置に設けられ、商用電源の停電時に前記ＡＣ／ＤＣ変換器の出力に代えてバッテリ切替回路で一次電池電源に切替える電源バックアップ手段を備えた監視端末と、この監視端末と上位コンピュータとの間で監視情報を通信する遠方監視システムにおいて、
前記電源バックアップ手段は、
前記商用電源の電圧低下を検出する電圧低下検出回路と、
前記電圧低下検出回路で検出された電圧低下検出信号を絶縁して取り込む外部−内部絶縁回路と、
前記外部−内部絶縁回路で絶縁され、取り込まれた電圧低下検出信号が与えられ、かつ前記ＡＣ／ＤＣ変換器の二次側出力が低下し始めたときに前記バッテリ切替回路に一次電池電源への切替え出力を得る電池制御回路と、
復電時に前記ＡＣ／ＤＣ変換器の一次側の電圧の復電を検出したときに前記バッテリ切替回路を商用電源側に切替え、前記上位コンピュータには無停電で復電通報などの処理を行う手段と、
を備えたことを特徴とする遠方監視システム。 A power backup means having an AC / DC converter for obtaining a control power from a commercial power supply, provided at a monitoring position, and switching to a primary battery power by a battery switching circuit instead of the output of the AC / DC converter in the event of a power failure of the commercial power In a remote monitoring system that communicates monitoring information between a monitoring terminal equipped with the monitoring terminal and a host computer,
The power backup means includes
A voltage drop detection circuit for detecting a voltage drop of the commercial power supply;
An external-internal insulation circuit that insulates and captures the voltage drop detection signal detected by the voltage drop detection circuit;
Insulated by the external-internal insulation circuit, when the taken-in voltage drop detection signal is given and the secondary output of the AC / DC converter starts to drop, the battery switching circuit is supplied to the primary battery power supply . A battery control circuit for obtaining a switching output;
Means for switching the battery switching circuit to the commercial power source side when the power recovery of the primary side voltage of the AC / DC converter is detected at the time of power recovery, and performing processing such as power recovery notification to the host computer without power failure When,
A remote monitoring system characterized by comprising: 商用電源から制御電源を得るＡＣ／ＤＣ変換器を有して監視位置に設けられ、商用電源の停電時に前記ＡＣ／ＤＣ変換器の出力に代えてバッテリ切替回路で一次電池電源に切替える電源バックアップ手段を備えた監視端末と、この監視端末と上位コンピュータとの間で監視情報を通信する遠方監視システムにおいて、
前記電源バックアップ手段は、
前記商用電源の電圧低下を検出する電圧低下検出回路と、
前記電圧低下検出回路で検出された電圧低下検出信号を絶縁して取り込む外部−内部絶縁回路と、
前記外部−内部絶縁回路で絶縁され、取り込まれた電圧低下検出信号をＮＭＩ割り込み信号とし、その時点の処理データの退避を行い、前記ＡＣ／ＤＣ変換器の二次側電圧低下が始まる直前にバッテリ切替信号を発生し、この後に前記上位コンピュータに停電通知を行うコンピュータ回路と、
前記外部−内部絶縁回路で絶縁され、取り込まれた電圧低下検出信号が与えられ、かつ前記コンピュータ回路からバッテリ切替信号を発生したときに前記バッテリ切替回路に一次電池電源への切替え出力を得る電池制御回路と、
復電時に前記ＡＣ／ＤＣ変換器の一次側の電圧の復電を検出したときに前記バッテリ切替回路を商用電源側に切替え、前記上位コンピュータには無停電で復電通報などの処理を行う手段と、
を備えたことを特徴とする遠方監視システム。 A power backup means having an AC / DC converter for obtaining a control power from a commercial power supply, provided at a monitoring position, and switching to a primary battery power by a battery switching circuit instead of the output of the AC / DC converter in the event of a power failure of the commercial power In a remote monitoring system that communicates monitoring information between a monitoring terminal equipped with the monitoring terminal and a host computer,
The power backup means includes
A voltage drop detection circuit for detecting a voltage drop of the commercial power supply;
An external-internal insulation circuit that insulates and captures the voltage drop detection signal detected by the voltage drop detection circuit;
A voltage drop detection signal insulated and captured by the external-internal insulation circuit is used as an NMI interrupt signal, processing data at that time is saved, and the battery immediately before the secondary voltage drop of the AC / DC converter starts. A computer circuit that generates a switching signal and then notifies the host computer of a power failure;
Battery control which is insulated by the external-internal insulation circuit and receives a voltage drop detection signal taken in, and obtains a switching output to the primary battery power source in the battery switching circuit when a battery switching signal is generated from the computer circuit Circuit,
Means for switching the battery switching circuit to the commercial power source side when the power recovery of the primary side voltage of the AC / DC converter is detected at the time of power recovery, and performing processing such as power recovery notification to the host computer without power failure When,
A remote monitoring system characterized by comprising: 商用電源から制御電源を得るＡＣ／ＤＣ変換器を有して監視位置に設けられ、商用電源の停電時に前記ＡＣ／ＤＣ変換器の出力に代えてバッテリ切替回路で一次電池電源に切替える電源バックアップ手段を備えた監視端末と、この監視端末と上位コンピュータとの間で監視情報を通信する遠方監視システムにおいて、
前記電源バックアップ手段は、
前記ＡＣ／ＤＣ変換器の二次側電圧が低下し始めたことを検出する電圧低下検出回路と、
前記電圧低下検出回路で検出された電圧低下検出信号で前記バッテリ切替回路に一次電池電源への切替え出力を得る電池制御回路と、
前記電池制御回路から発生する停電検出信号でＮＭＩ割り込み信号とし、その時点の処理データの退避および前記上位コンピュータに停電通知を行い、この後に前記電池制御回路に一次電池電源による駆動切りの信号を発生するコンピュータ回路と、
復電時にＡＣ／ＤＣ変換器の二次側の電圧の復電を検出したときに前記バッテリ切替回路を商用電源側に切替え、前記上位コンピュータには無停電で復電通報などの処理を行う手段と、
を備えたことを特徴とする遠方監視システム。 A power backup means having an AC / DC converter for obtaining a control power from a commercial power supply, provided at a monitoring position, and switching to a primary battery power by a battery switching circuit instead of the output of the AC / DC converter in the event of a power failure of the commercial power In a remote monitoring system that communicates monitoring information between a monitoring terminal equipped with the monitoring terminal and a host computer,
The power backup means includes
A voltage drop detection circuit for detecting that the secondary side voltage of the AC / DC converter has started to drop;
A battery control circuit for obtaining a switching output to a primary battery power source in the battery switching circuit by a voltage drop detection signal detected by the voltage drop detection circuit;
The power failure detection signal generated from the battery control circuit is used as an NMI interrupt signal, the processing data at that time is saved and a power failure notification is sent to the host computer, and then a signal for turning off the primary battery power is generated in the battery control circuit. Computer circuit to
Means for switching the battery switching circuit to the commercial power supply side when the power recovery of the secondary side voltage of the AC / DC converter is detected at the time of power recovery, and performing processing such as power recovery notification to the host computer without power failure When,
A remote monitoring system characterized by comprising:
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